from fastapi import FastAPI, Response, Request, Header, Form, UploadFile, Body, BackgroundTasks
from pydantic import BaseModel
from fastapi.responses import FileResponse
from starlette.middleware.cors import CORSMiddleware
from starlette.responses import RedirectResponse
import subprocess

from cardtagger import cardtagger

import io
from PIL import Image
import os, time

app = FastAPI()
app.add_middleware(
CORSMiddleware,
allow_origins=["*"], # Allows all origins
allow_credentials=True,
allow_methods=["*"], # Allows all methods
allow_headers=["*"], # Allows all headers
)

# API_TOKEN = os.environ["API_TOKEN"]
API_TOKEN = '34dsadfF$$%#$TGREGEFGE%Q*)(*&%'

card_is_running = True

# ---------------------------------------------------------------------------
# - Token auth method -
# ---------------------------------------------------------------------------
def check_auth(authorization_header):
    if authorization_header == API_TOKEN :
        return True
    else:
        return False

# ---------------------------------------------------------------------------
# - Delete cache files after 30 days -
# ---------------------------------------------------------------------------
def delete_old_files():
    path = "./tmp"
    now = time.time()

    for filename in os.listdir(path):
        filestamp = os.stat(os.path.join(path, filename)).st_mtime
        filecompare = now - 14 * 86400
        if filestamp < filecompare:
            print(filename)
            os.remove(os.path.join(path, filename))

# @app.on_event("startup")
# def startup_event(background_tasks: BackgroundTasks):
#     '''
#     Create out dir
#     '''
#     if not os.path.exists("/tmp"):
#         os.makedirs("/tmp")
#
#     background_tasks.add_task(check_gpu_usage)

@app.get("/")
async def root():
    response = RedirectResponse(url='/docs')
    
    return response

@app.post("/cardtagger")
async def resolution(request: Request, background_tasks: BackgroundTasks, response: Response, data: UploadFile = Form(...)):

    authorization_token = request.headers.get("Authorization", None)

    # check_token = check_auth(authorization_token)
    check_token = True

    if check_token:
        card_is_running = True
        # background_tasks.add_task(check_gpu_usage)

        image = io.BytesIO(await data.read())
        image.seek(0)

        # background_tasks.add_task(check_gpu_usage)
        result = cardtagger(image.read())
        card_is_running = False
        background_tasks.add_task(delete_old_files)

        return result


    else :
        response.status_code = 401
        return response


def check_gpu_usage():
    try:
        while card_is_running:
            output = subprocess.check_output("nvidia-smi", shell=True).decode("utf-8")
            # lines = output.split('\n')
            #
            # for line in lines:
            #     if '%' in line:
            #         print(line.strip().split(' ')[-2])
            print(output)
        return
    except subprocess.CalledProcessError:
        print("Nvidia-smi command not found, please check if the NVIDIA drivers are installed.")
        return "Nvidia-smi command not found, please check if the NVIDIA drivers are installed."




#uvicorn server:app --host 0.0.0.0 --port 5050 --workers 4